Kiss, László (MTA Konkoly
Observatory)
Time-series analysis in variable
star astronomy: recent advances in the physics of stellar oscillations
Observations of brightness variations
of stars can reveal unique astrophysical information that is beyond reach
otherwise. Most notably asteroseismology, the study of internal structure of
stars via interpreting their oscillation spectra, has seen a tremendous
development in the last 10-15 years. The roots of this lie in the advances of
space photometry, a special technique for obtaining 10^{-6} relative precision
in the brightness measurements and in the new tools in modelling and
interpreting the time-series observations. In addition to the classical linear
analyses, such as the variations of the Fourier-technique, a range of
time-frequency methods has been applied to real empirical data to detect hidden
regular structures in the signals that can have physical implications. On the other
hand, the use of non-linear methods, such as phase space reconstruction and the
detection of low-dimensional chaos in astrophysical systems, has also seen an
increased popularity due to the new kind of data made possible by the dedicated
space photometric missions. Here we present some of the most fundamental tools
that are used in stellar astrophysics and highlight the most spectacular
results that were obtained by these seemingly "boring" computational
methods.
The talk is held in English!
Az előadás nyelve angol!
Date: Oct 1, Tuesday 4:15pm
Place: BME, Building „Q”, Room QBF13